Pipe swedge



Oct. 19, 1937. w, Q ERWIN 2,096,234

PIPE SWEDGE Filed Feb. 8, 1936 l 1L i www 1 I i i e 1 1 l. I I 4]Ml I 2/ 1 L1 i 1 l l I v 1 29 40 l 4 mm: 1 I I 29 Y 1 1 Jl 1 a# 3/ g 255 e@ 5j 1 1. 1 1 j Ff 25 /a I nl" l. l .1 :1 1 1 26- 1: 1: 27 1 1 /g 1 Il 1I i Il l 1| 'l i /6 |1 1| 1 1| /4 l /4 1 1| |1 Il 1 1I Il g ll .:l

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Patented Oct. 19, 1937 UNETED STATES FATET PIPE SWEDGE Weldon C. Erwin, Huntington Park, Calif., as-

signor to John Grant, Los Angeles, Calif.

This invention has to Vdo with Van `improved type of pipe swedge that operates by advancement through the pipe to expand it from collapsed condition, and, if desired, simultaneously to round out the pipe to substantially true circularV form. While it is generally useful for swedging allkinds of pipe, the invention has been made particularly tot provide a tool for expanding and rounding out collapsed casing in wells, and for eliminating many of the disadvantages and undesirable features of the usual well casing swedges.

The present tool may be characterized as a rotatably driven type comprising a member shaped to expand the pipe by advancement through it, and means whereby rotation of the driving stem causes a succession of advancing blows to be imparted to the swedging member. The latter operates to expand the pipe to generally rounded form, and, for certain types of work, the degree of expansion and rounding out accomplished by the swedging member may be suicient. However, I generally prefer to include in the tool, additional means for rounding the pipe to true circular form immediately following the expansive action of the swedging member. For this purpose I provide, preferably, a plurality of circularly spaced rollers carried on the body of the tool, these rollers ttingthe casing closely and traveling in a true circular path. a

In'its preferred form, my improved pipe swedge comprises a body connected with the rotatable driving stem, a mandrel extending axially from the body, and a tapered swedge sleeve carried on the mandrel and movable longitudinally and rotatablyrrelative to both the mandrel and body. The body and swedge sleeve are provided with interengaging annular cam surfaces having abrupt shoulders arranged so that as it rotates relative toV the sleeve, the body slips off the shoulders and strikes the sleeve to deliver to it a succession of blows at al frequency in accordance with the rate at which the body is rotated. The sleeve thus is driven between the collapsed walls of the pipe, and immediately after the walls became expanded,'they are engaged by the rollers and rounded out to true circular form. In addition to the efliciency and easerwith which it operates, the present tool is characterized byY its extremely simple andrugged construction, and, consequently, its great strength and ability to withstand the' severe conditions incident to its use.

The above mentioned as well as numerous features and advantages of the invention will .be

more fully'understood and explained to better advantage in the following detailed description of the invention in one of its typical and'p-referred forms. v .Y

Throughout the description Areference is had to the accompanying drawing, in which: Y

Fig. 1 is an elevation showing the swedge within a well casing, the body and sleeve sections being parted to more clearly illustrateY the cam surfaces; Y

Fig. 2 is a view similarV to Fig. 1 showing the parts at the slip-off position ;Y y

Fig. 3 is a sectional view similar to Fig. 2; and

Fig. 4 is a body section taken on line lI-lI of Y' Fig. 1.

In the drawing, the swedging tool, generally indicated at I0, is shown positioned within the well casing II ata point above the partially co-llapsed portion IIa thereof. For purposes of de-` scription, the pipe swedge It) may be regarded in one aspect as comprising a pair of relatively rotatable body sections I2 and I3, section I2 comprising the swedging member which ,expands the collapsed Lwalls IIa of the casing as it is driven between them, and section I3 the driving member which drives the swedging member as the two sections rotate relatively,VV section I2 has a generally tapering curved shape along-its lower surface I4 below its upper cylindric portion I5 which more or less closely nts the wall of the casing. The'surface I4 is substantially straight for a distance, and then curves inwardly at-its lower end, as illustrated at Illa.

structurally, the tool may also be considered as comprising a body I3, a mandrel I5 extending axially below the lower end of the body, and a swedge sleeve I2 which is movable longitudinally and rotatable relative to both the mandrel and body i3. Longitudinal movement of sleeve I2 on the mandrel I 5 is limited downwardly by engagement of the sleeve Vwith an enlargement VIa o-n the lower end of. the mandrel, and upwardly by engagement between cam surface I'I on the upper end of the sleeve with a Vcorrespondingly shaped cam surfacei on the body. In elect, the body I3 and mandrel I S are integral, although for convenience in construction the body proper may b-e formed by a sleeve 'i3d having a tightly shrunk fit on the upper enlarged diameter portion Ib of the mandrel.

The pipe swedge is operated by a rotatably driven stem which, in the present instance, consists of the drill pipe I9 and a connection 23 with body I3 of the tool. The connection at Ztl may be Vof any suitable type, and is here shown typically as comprising a shank 2i in the form of an upper continuation of the mandrel |67, and

connected to the drill string by coupling 22.

are substantially straight, i. e., without appre"V ciable slope, as are alsothe surfaces between the sloping cam surfaces and the bases of s-houlj ders 25.

Referring now to Fig. 3, the` upper end ofv sleeve I2 is counterbored toy receive the large` diameter portion IibI of the mandrel, andl toprovide a stop shoulder 21 which is engagedby the mandrel to limit downward movement of the body I3 relative to sleeve i2 and to preventcam surfaces 23 on the body from engaging the'sleeve surfaces 25,k when the parts have rotated rela-` v tively to the slip-off positionof Fig. 2.

kAs best illustrated in Fig. 4., the body I'coni tains a Yplurality of vertically extendingr and equally circularly spaced recesses 2S, the upper ends. of which are` closed by a Vretaimng ring .2d secured to the body by screws'liii. Ring 29 bears against the mandrel shoulder@ to'prevent me n- Vber lhfrombecoming jarred loose, and moving ing sufficient toretain the rollers.V Preferably, Y

the rollers t the recesses with suiicient looseness as to permit their rotation while in engagement with the casing during rotation of the body. In well casing swedging operations it may be desired t@ maintain a flow ofv circulating iiuid through the tool so that the fluid will be dis-k charged inthe vicinity of the swedging sleeve. For this purpose I drill the full length of the mandrel Vto provide a bore 4I through which the fluid is discharged downwardly from pipe I9 through the tool and out vthe lower enlarged; end Ia of the mandrel. Y b

VIn operation, the tool is lowered within the casing on the lower end of the drill string until: the swedge sleeve l2 engages'the collapsed wall IIa. Thereupon, the pipe string is rotated and the necessary amount of weight applied to the swedge sleeve via engagement with the body I3 at the cam surfaces I'I and I8. As the pipeV isV rotated in the direction of theV arrow, bodycam surface i3' rises over the sleeve surface Il and,

relative to the sleeve, thelatteris subjected to Y a succession oi" downwardly'ap-plied blows, act,- ing to drive` it between the collapsed walls ila of the casing and toV expand the latterV to the diameter of the upper, portion I5 of the sleeve. The casing then is rounded out to true circular A form by the action of the equally spaced rollers 3l whose outer peripheries travel a true circular path, V V

|The provision for substantial relative longitudinal movement between the sleeve l2 and Y been expanded Vby said member.

mandrel maybe utilized to advantage in an upward jarring operation to free the sleeve from the casing in the event the sleeve should become tightly wedged within the casing. By repeated Y upward jarring movements of the pipe string and mandrel, the enlargement Ia'on thelower end of the mandrel is caused to impact against the lower end of the sleeve, and therebyrdrive it upwardly from. wedged position'in the casing. It may be mentioned that thelower reduced portion of the mandrel within the'V sleeve may be made as long as is necessary or desired to enable the mandrel to deliver to the sleeve an eiec- Y tive blow in the upward jarring operation.

` ItV will be understood that the drawing isV merely'typical andillustrative of the invention in one of its preferred forms, and that various changes in modications may be made without departure from theinvention in its true spirit and scope.

Iclaim: i l

-V l '1. Inra pipe swedge, a body comprisingY a mem-- ber shaped to expand the pipe from collapsed condition by advancement through the pipe, driv-V ing means connectedto Vsaid body, and means adapted to be insertedwithinthe pipe and coacting with said memberto transmit thereto a succession Vof advancing blows by rotation of said drivingmeans. Y Y -Y 2. In a pipe swedge, a body comprisingla member sl'iapedV to expand the pipe from collapsed condition by advancement through the pipa-drive 43. In a pipe swedge, a body comprising a meml ber having a longitudinallycurved tapered surface adapted to engage-and expand the pipe from collapsed conditionrby` .advancement through the pipe, driving means connected to said body, means adapted to be inserted within the pipe and Vcoacting with said member to transmit thereto "a,

relatively, and means `for Vtransmitting to the firstV mentioned body section-a succession of advancingv blows by virtue Vof relative rotation between the sectionsl Y 5., Ina 'pipe swedge, a body adapted `to be in- Vserted-in `a pipe and comprisinga pair of relae tively rotatable sections, one of said sections being adapted to engage and expand the pipe from collapsed condition by advancement through Ythe pipe, rotatable drivingsmeans connected tofsaidbody and adapted to cause said sections,k to` rotate relatively, means for transmitting tothe first mentioned body section a succession of advancing blows by rotation of said driving means, and meansoperated by the driving means -for rounding out the pipe after it has been expanded by the first mentioned body section.A e

6. In a pipe swedge,Y a body adapted to be inserted in a pipe and comprising a pair of relatively rotatable sections, one of Vsaid sections being adapted to engage and expand the pipe from collapsed condition by advancement through the pipe, means carried by the other of said sections for rounding out the pipe, rotatable driving means connected to said body and adapted to cause said sections to rotate relatively, and means for transmitting to the first mentioned body section a succession of advancing blows by virtue of relative rotation between the sections.

'7. A pipe swedge comprising a body adapted to be inserted in a pipe, a mandrel extending axially from one end of said body, rotatable driving means extending from the opposite end of the body, a swedge sleeve mounted on said mandrel and movable longitudinally and rotatably relative to both the mandrel and body, and interengaging annular cam surfaces on said body and sleeve having abrupt slip-01T shoulders, whereby the body imparts to the sleeve a succession of advancing blows upon rotation relative thereto.

8. A pipe swedge comprising a body adapted to be inserted in a pipe and a mandrel extending axially from one end of said body, rotatable driving means extending from the opposite end of the body, a swedge sleeve mounted on said mandrel and movable longitudinally and rotatably relative to both the mandrel and body, in-

'terengaging annular cam surfaces on said body and sleeve having abrupt slip-off shoulders, whereby the body imparts to the sleeve a succession of advancing blows upon rotation relativeV thereto, and means carried by said body 'for engaging and rounding out the pipe.

9. A pipe swedge comprising a body adapted to be inserted in a pipe and a mandrel extending axially vfrom one end of said body, rotatable driving means extending from the opposite end of the body, a swedge sleeve mounted on said mandrel and movable longitudinally and rotatably relative to both the mandrel and body, interengaging annular cam surfaces on said body and sleeve having abrupt slip-oil shoulders, whereby the body imparts to the sleeve a succession of advancing blows upon rotation relative thereto,

and a plurality of rollers carried in crcularly spaced recesses in the surface of said body.

10. A pipe swedge comprising a body adapted tov be inserted in a pipe and a mandrel extendingy axially from one end of said body, rotatable driving means extending from the opposite end of the body, a swedge sleeve mounted on said mandrel and movable longitudinally and rotatably relative to both the mandrel and body, interengaging annular cam surfaces on said body and sleeve having abrupt slip-off shoulders, whereby the body imparts to the sleeve a succession of advancing blows upon rotation relative thereto, a plurality of rollers carried in circularly spaced recesses inthe surface of said body, and a roller retaining ring closing the ends of said recesses and secured to the body.

WELDON C. ERWIN. 

